methyl 4-[(carbamothioylamino)methyl]benzoate

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a suspension of 1-(4-methoxycarbonylbenzyl)-2-thiourea (138.0 g, 0.554 mol) obtained in Example 1(1) in acetonitrile (1380 ml, 10.0 v/w) were successively added 2-bromo-4′-nitroacetophenone (124.1 g, 0.554 mol) and sodium bicarbonate (46.9 g, 0.559 mol), and the mixture was heated under reflux for 2 hr. After cooling to room temperature, water (1380 ml, 10.0 v/w) and n-hexane (690 ml, 5.0 v/w) were successively added and the mixture was stirred for 1 hr. The precipitated crystals were collected by filtration, washed successively with water (1000 ml) and n-hexane (500 ml) and dried in vacuo to give the title compound (183.9 g, yield 89.9%) as a yellow solid. the mixture was heated under reflux for 2 hr The precipitated crystals were collected by filtration washed successively with water (1000 ml) and n-hexane (500 ml) dried in vacuo

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Under an argon atmosphere, to a suspension of methyl 4-aminomethylbenzoate hydrochloride (170.0 g, 0.843 mol) in chloroform (850 ml, 5.0 v/w) were successively added 1,1′-thiocarbonyldiimidazole (purity 90%, 166.0 g, 0.843 mol) and triethylamine (123 ml, 0.885 mol). After stirring at room temperature for 3 hr, 28% aqueous ammonia (570 ml, 8.43 mol) and methanol (170 ml, 1.0 v/w) were added and the mixture was stirred overnight. n-Hexane (1700 ml, 10.0 v/w) and water (850 ml, 5.0 v/w) were successively added to the reaction mixture and the mixture was stirred at room temperature for 3 hrs. The precipitated crystals were collected by filtration, washed successively with n-hexane (500 ml) and water (500 ml) and dried in vacuo to give the title compound (172.5 g, yield 91.3%) as a colorless solid. the mixture was stirred overnight the mixture was stirred at room temperature for 3 hrs The precipitated crystals were collected by filtration washed successively with n-hexane (500 ml) and water (500 ml) dried in vacuo